First submission so be generous! Tried to find the chords for this version but 
only came across John Martyn's rendition. As lovely as it is, it's not quite this 
one. 
The chord pattern is the same the whole way through so I'll only include one 
verse, but you literally just play the same thing throughout the whole song. Seth 
Plays this on a tenor guitar, so this is different to what he plays, but works 
through the whole song. 90% sure this is correct.

Capo 1

     A                    Dsus2       E
This tune was composed by Spencer the Rover
   A         Dsus2                  E
As valiant a man that had ever left home
        Bm         A               Dsus2        E
For had been much reduced and this caused great confusion
    A            Dsus2     E
And that was the reason he started to rove